Rust, for instance (z not s) (7)
I believe the answer is:
oxidize
(Other definitions for oxidize that I've seen before include "having become rusty" , "Apply gas to" .)
I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.